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linux/drivers/mmc/core/host.c

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mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
/*
* linux/drivers/mmc/core/host.c
*
* Copyright (C) 2003 Russell King, All Rights Reserved.
mmc: set controller name early Reorganise code so that mmc_hostname() works directly after allocation. That way host drivers can use that name for resource allocations and messages during probing. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-03-09 06:43:19 +08:00
* Copyright (C) 2007-2008 Pierre Ossman
mmc: Aggressive clock gating framework This patch modifies the MMC core code to optionally call the set_ios() operation on the driver with the clock frequency set to 0 (gate) after a grace period of at least 8 MCLK cycles, then restore it (ungate) before any new request. This gives the driver the option to shut down the MCI clock to the MMC/SD card when the clock frequency is 0, i.e. the core has stated that the MCI clock does not need to be generated. It is inspired by existing clock gating code found in the OMAP and Atmel drivers and brings this up to the host abstraction. Gating is performed before and after any MMC request. This patchset implements this for the MMCI/PL180 MMC/SD host controller, but it should be simple to switch OMAP/Atmel over to using this instead. mmc_set_{gated,ungated}() add variable protection to the state holders for the clock gating code. This is particularly important when ordinary .set_ios() calls would race with the .set_ios() call resulting from a delayed gate operation. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Chris Ball <cjb@laptop.org> Tested-by: Chris Ball <cjb@laptop.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2010-11-09 10:36:50 +08:00
* Copyright (C) 2010 Linus Walleij
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* MMC host class device management
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/idr.h>
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
#include <linux/of.h>
#include <linux/of_gpio.h>
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
#include <linux/pagemap.h>
mmc: Add export.h for EXPORT_SYMBOL/THIS_MODULE as required These two basic defines were everywhere, simply because module.h was also everywhere. But we are cleaning up the latter. So make the exporters actually call out their need for the include. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-07-11 00:42:00 +08:00
#include <linux/export.h>
mmc: add led trigger Add a led trigger for each host controller that indicates if there is a request active on the controller. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-09-24 13:15:48 +08:00
#include <linux/leds.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
#include <linux/mmc/host.h>
mmc: Aggressive clock gating framework This patch modifies the MMC core code to optionally call the set_ios() operation on the driver with the clock frequency set to 0 (gate) after a grace period of at least 8 MCLK cycles, then restore it (ungate) before any new request. This gives the driver the option to shut down the MCI clock to the MMC/SD card when the clock frequency is 0, i.e. the core has stated that the MCI clock does not need to be generated. It is inspired by existing clock gating code found in the OMAP and Atmel drivers and brings this up to the host abstraction. Gating is performed before and after any MMC request. This patchset implements this for the MMCI/PL180 MMC/SD host controller, but it should be simple to switch OMAP/Atmel over to using this instead. mmc_set_{gated,ungated}() add variable protection to the state holders for the clock gating code. This is particularly important when ordinary .set_ios() calls would race with the .set_ios() call resulting from a delayed gate operation. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Chris Ball <cjb@laptop.org> Tested-by: Chris Ball <cjb@laptop.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2010-11-09 10:36:50 +08:00
#include <linux/mmc/card.h>
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
#include <linux/mmc/slot-gpio.h>
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
#include "core.h"
#include "host.h"
mmc: slot-gpio: Rework how to handle allocation of slot-gpio data By moving the allocation of the slot-gpio data into mmc_alloc_host(), we can remove the slot-gpio internal calls to mmc_gpio_alloc(). This means mmc_gpio_alloc() has now only one caller left, which consequence allow us to simplify and remove some of the slot-gpio code. Additionally, this makes the slot-gpio mutex redundant, so let's remove it. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 22:44:36 +08:00
#include "slot-gpio.h"
mmc: core: Initial support for MMC power sequences System on chip designs may specify a specific MMC power sequence. To successfully detect an (e)MMC/SD/SDIO card, that power sequence must be followed while initializing the card. To be able to handle these SOC specific power sequences, let's add a MMC power sequence interface. It provides the following functions to help the mmc core to deal with these power sequences. mmc_pwrseq_alloc() - Invoked from mmc_of_parse(), to initialize data. mmc_pwrseq_pre_power_on()- Invoked in the beginning of mmc_power_up(). mmc_pwrseq_post_power_on()- Invoked at the end in mmc_power_up(). mmc_pwrseq_power_off()- Invoked from mmc_power_off(). mmc_pwrseq_free() - Invoked from mmc_free_host(), to free data. Each MMC power sequence provider will be responsible to implement a set of callbacks. These callbacks mirrors the functions above. This patch adds the skeleton, following patches will extend the core of the MMC power sequence and add support for a specific simple MMC power sequence. Do note, since the mmc_pwrseq_alloc() is invoked from mmc_of_parse(), host drivers needs to make use of this API to enable the support for MMC power sequences. Moreover the MMC power sequence support depends on CONFIG_OF. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
2014-11-28 21:38:36 +08:00
#include "pwrseq.h"
mmc: sdio: Add API to manage SDIO IRQs from a workqueue For hosts not supporting MMC_CAP2_SDIO_IRQ_NOTHREAD but MMC_CAP_SDIO_IRQ, the SDIO IRQs are processed from a dedicated kernel thread. For these cases, the host calls mmc_signal_sdio_irq() from its ISR to signal a new SDIO IRQ. Signaling an SDIO IRQ makes the host's ->enable_sdio_irq() callback to be invoked to temporary disable the IRQs, before the kernel thread is woken up to process it. When processing of the IRQs are completed, they are re-enabled by the kernel thread, again via invoking the host's ->enable_sdio_irq(). The observation from this, is that the execution path is being unnecessary complex, as the host driver already knows that it needs to temporary disable the IRQs before signaling a new one. Moreover, replacing the kernel thread with a work/workqueue would not only greatly simplify the code, but also make it more robust. To address the above problems, let's continue to build upon the support for MMC_CAP2_SDIO_IRQ_NOTHREAD, as it already implements SDIO IRQs to be processed without using the clumsy kernel thread and without the ping-pong calls of the host's ->enable_sdio_irq() callback for each processed IRQ. Therefore, let's add new API sdio_signal_irq(), which enables hosts to signal/process SDIO IRQs by using a work/workqueue, rather than using the kernel thread. Add also a new host callback ->ack_sdio_irq(), which the work invokes when the SDIO IRQs have been processed. This informs the host about when it shall re-enable the SDIO IRQs. Potentially, we could re-use the existing ->enable_sdio_irq() callback instead of adding a new one, however it has turned out that it's more convenient for hosts to get this information via a separate callback. Hosts that wants to use this new method to signal/process SDIO IRQs, must enable MMC_CAP2_SDIO_IRQ_NOTHREAD and implement the ->ack_sdio_irq() callback. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org>
2017-04-13 22:48:11 +08:00
#include "sdio_ops.h"
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
mmc: core: Convert from IDR to IDA for host indexes As IDA is more lightweight than IDR, let's convert to use that instead. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-04-07 17:40:59 +08:00
static DEFINE_IDA(mmc_host_ida);
mmc: core: Free all resources for the class device at ->dev_release() To be consistent when freeing data, let's move the idr_remove() call from mmc_free_host() into the ->dev_release() callback for the class device. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 22:44:35 +08:00
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
static void mmc_host_classdev_release(struct device *dev)
{
struct mmc_host *host = cls_dev_to_mmc_host(dev);
mmc: core: simplify ida handling ida handling can be simplified by switching to the ida_simple_ functions. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-01-28 16:32:35 +08:00
ida_simple_remove(&mmc_host_ida, host->index);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
kfree(host);
}
static struct class mmc_host_class = {
.name = "mmc_host",
.dev_release = mmc_host_classdev_release,
};
int mmc_register_host_class(void)
{
return class_register(&mmc_host_class);
}
void mmc_unregister_host_class(void)
{
class_unregister(&mmc_host_class);
}
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
void mmc_retune_enable(struct mmc_host *host)
{
host->can_retune = 1;
if (host->retune_period)
mod_timer(&host->retune_timer,
jiffies + host->retune_period * HZ);
}
mmc: core: Add a facility to "pause" re-tuning Re-tuning is not possible when switched to the RPMB partition. However re-tuning should not be needed if re-tuning is done immediately before switching, a small set of operations is done, and then we immediately switch back to the main partition. To ensure that re-tuning can't be done for a short while, add a facility to "pause" re-tuning. The existing facility to hold / release re-tuning is used but it also flags re-tuning as needed to cause re-tuning before the next command (which will be the switch to RPMB). We also need to "unpause" in the recovery path, which is catered for by adding it to mmc_retune_disable(). Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-05-16 20:35:24 +08:00
/*
* Pause re-tuning for a small set of operations. The pause begins after the
* next command and after first doing re-tuning.
*/
void mmc_retune_pause(struct mmc_host *host)
{
if (!host->retune_paused) {
host->retune_paused = 1;
mmc_retune_needed(host);
mmc_retune_hold(host);
}
}
EXPORT_SYMBOL(mmc_retune_pause);
void mmc_retune_unpause(struct mmc_host *host)
{
if (host->retune_paused) {
host->retune_paused = 0;
mmc_retune_release(host);
}
}
EXPORT_SYMBOL(mmc_retune_unpause);
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
void mmc_retune_disable(struct mmc_host *host)
{
mmc: core: Add a facility to "pause" re-tuning Re-tuning is not possible when switched to the RPMB partition. However re-tuning should not be needed if re-tuning is done immediately before switching, a small set of operations is done, and then we immediately switch back to the main partition. To ensure that re-tuning can't be done for a short while, add a facility to "pause" re-tuning. The existing facility to hold / release re-tuning is used but it also flags re-tuning as needed to cause re-tuning before the next command (which will be the switch to RPMB). We also need to "unpause" in the recovery path, which is catered for by adding it to mmc_retune_disable(). Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-05-16 20:35:24 +08:00
mmc_retune_unpause(host);
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
host->can_retune = 0;
del_timer_sync(&host->retune_timer);
host->retune_now = 0;
host->need_retune = 0;
}
void mmc_retune_timer_stop(struct mmc_host *host)
{
del_timer_sync(&host->retune_timer);
}
EXPORT_SYMBOL(mmc_retune_timer_stop);
void mmc_retune_hold(struct mmc_host *host)
{
if (!host->hold_retune)
host->retune_now = 1;
host->hold_retune += 1;
}
mmc: core: Add mmc_retune_hold_now() mmc_return_hold() / mmc_retune_release() are used around a group of commands to prevent re-tuning between the commands. Re-tuning can still happen before the first command. In some cases, re-tuning must be prevented entirely. Add mmc_retune_hold_now() for that purpose. It is added in preparation for CQE support where it will be used by CQE recovery. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-08-10 20:08:06 +08:00
void mmc_retune_hold_now(struct mmc_host *host)
{
host->retune_now = 0;
host->hold_retune += 1;
}
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
void mmc_retune_release(struct mmc_host *host)
{
if (host->hold_retune)
host->hold_retune -= 1;
else
WARN_ON(1);
}
int mmc_retune(struct mmc_host *host)
{
mmc: core: Add support for HS400 re-tuning HS400 re-tuning must be done in HS200 mode. Add the ability to switch from HS400 mode to HS200 mode before re-tuning and switch back to HS400 after re-tuning. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:20 +08:00
bool return_to_hs400 = false;
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
int err;
if (host->retune_now)
host->retune_now = 0;
else
return 0;
if (!host->need_retune || host->doing_retune || !host->card)
return 0;
host->need_retune = 0;
host->doing_retune = 1;
mmc: core: Add support for HS400 re-tuning HS400 re-tuning must be done in HS200 mode. Add the ability to switch from HS400 mode to HS200 mode before re-tuning and switch back to HS400 after re-tuning. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:20 +08:00
if (host->ios.timing == MMC_TIMING_MMC_HS400) {
err = mmc_hs400_to_hs200(host->card);
if (err)
goto out;
return_to_hs400 = true;
if (host->ops->prepare_hs400_tuning)
host->ops->prepare_hs400_tuning(host, &host->ios);
}
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
err = mmc_execute_tuning(host->card);
mmc: core: Add support for HS400 re-tuning HS400 re-tuning must be done in HS200 mode. Add the ability to switch from HS400 mode to HS200 mode before re-tuning and switch back to HS400 after re-tuning. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:20 +08:00
if (err)
goto out;
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
mmc: core: Add support for HS400 re-tuning HS400 re-tuning must be done in HS200 mode. Add the ability to switch from HS400 mode to HS200 mode before re-tuning and switch back to HS400 after re-tuning. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:20 +08:00
if (return_to_hs400)
err = mmc_hs200_to_hs400(host->card);
out:
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
host->doing_retune = 0;
return err;
}
static void mmc_retune_timer(unsigned long data)
{
struct mmc_host *host = (struct mmc_host *)data;
mmc_retune_needed(host);
}
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
/**
* mmc_of_parse() - parse host's device-tree node
* @host: host whose node should be parsed.
*
* To keep the rest of the MMC subsystem unaware of whether DT has been
* used to to instantiate and configure this host instance or not, we
* parse the properties and set respective generic mmc-host flags and
* parameters.
*/
mmc: return mmc_of_parse() errors to caller In addition to just logging errors encountered during DT parsing or allocating GPIO slots for CD/WP, mmc_of_parse() now returns with an error. In particular, this is needed if the GPIO allocation may return EPROBE_DEFER. Signed-off-by: Simon Baatz <gmbnomis@gmail.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 04:14:11 +08:00
int mmc_of_parse(struct mmc_host *host)
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
{
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
struct device *dev = host->parent;
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
u32 bus_width;
mmc: host: use of_property_read_bool() Use more compact of_property_read_bool() calls instead of the of_find_property() calls. Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-08-07 06:06:48 +08:00
int ret;
mmc: core: fix card detection regression Since commit 89168b489915 ("mmc: core: restore detect line inversion semantics"), the SD card on i.MX28 (and possibly other) devices isn't detected and booting stops at: [ 4.120617] Waiting for root device /dev/mmcblk0p3... This is caused by the MMC_CAP2_CD_ACTIVE_HIGH flag being set incorrectly when the host controller doesn't use a GPIO for card detection (but instead uses a dedicated pin). In this case mmc_gpiod_request_cd() will return before assigning to the gpio_invert variable, leaving the variable uninitialized. The variable then gets used to set the flag. This patch fixes the issue by making sure gpio_invert is set to false when a GPIO isn't used. After this patch, i.MX28 boots fine. The MMC_CAP2_RO_ACTIVE_HIGH (write protect) flag is also set incorrectly for the exact same reason (it uses the same uninitialized variable), so this patch fixes that too. Fixes: 89168b489915 ("mmc: core: restore detect line inversion semantics") Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-11-05 08:22:41 +08:00
bool cd_cap_invert, cd_gpio_invert = false;
bool ro_cap_invert, ro_gpio_invert = false;
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (!dev || !dev_fwnode(dev))
mmc: return mmc_of_parse() errors to caller In addition to just logging errors encountered during DT parsing or allocating GPIO slots for CD/WP, mmc_of_parse() now returns with an error. In particular, this is needed if the GPIO allocation may return EPROBE_DEFER. Signed-off-by: Simon Baatz <gmbnomis@gmail.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 04:14:11 +08:00
return 0;
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
dev_dbg(host->parent,
"\"bus-width\" property is missing, assuming 1 bit.\n");
bus_width = 1;
}
switch (bus_width) {
case 8:
host->caps |= MMC_CAP_8_BIT_DATA;
/* Hosts capable of 8-bit transfers can also do 4 bits */
case 4:
host->caps |= MMC_CAP_4_BIT_DATA;
break;
case 1:
break;
default:
dev_err(host->parent,
mmc: core: typo fix in printk specifier Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-02-15 19:40:58 +08:00
"Invalid \"bus-width\" value %u!\n", bus_width);
mmc: return mmc_of_parse() errors to caller In addition to just logging errors encountered during DT parsing or allocating GPIO slots for CD/WP, mmc_of_parse() now returns with an error. In particular, this is needed if the GPIO allocation may return EPROBE_DEFER. Signed-off-by: Simon Baatz <gmbnomis@gmail.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 04:14:11 +08:00
return -EINVAL;
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
}
/* f_max is obtained from the optional "max-frequency" property */
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
device_property_read_u32(dev, "max-frequency", &host->f_max);
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
/*
* Configure CD and WP pins. They are both by default active low to
* match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
* mmc-gpio helpers are used to attach, configure and use them. If
* polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
* and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
* "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
* is set. If the "non-removable" property is found, the
* MMC_CAP_NONREMOVABLE capability is set and no card-detection
* configuration is performed.
*/
/* Parse Card Detection */
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "non-removable")) {
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
host->caps |= MMC_CAP_NONREMOVABLE;
} else {
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "broken-cd"))
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
host->caps |= MMC_CAP_NEEDS_POLL;
mmc: core: restore detect line inversion semantics commit 98e90de99a0c43bd434da814c882c4332441871e "mmc: host: switch OF parser to use gpio descriptors" switched the semantic behaviour of card detect and read only flags such that the inversion capability flag would only be set if inversion was explicitly specified in the device tree, in the hopes that no-one was using double inversion. It turns out that the XOR:ing between the explicit inversion was indeed in use, so we need to restore the old semantics where both ways of inversion are checked and the end result XOR:ed. Reported-by: Javier Martinez Canillas <javier@dowhile0.org> Tested-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-10-02 15:08:46 +08:00
ret = mmc_gpiod_request_cd(host, "cd", 0, true,
mmc: core: fix card detection regression Since commit 89168b489915 ("mmc: core: restore detect line inversion semantics"), the SD card on i.MX28 (and possibly other) devices isn't detected and booting stops at: [ 4.120617] Waiting for root device /dev/mmcblk0p3... This is caused by the MMC_CAP2_CD_ACTIVE_HIGH flag being set incorrectly when the host controller doesn't use a GPIO for card detection (but instead uses a dedicated pin). In this case mmc_gpiod_request_cd() will return before assigning to the gpio_invert variable, leaving the variable uninitialized. The variable then gets used to set the flag. This patch fixes the issue by making sure gpio_invert is set to false when a GPIO isn't used. After this patch, i.MX28 boots fine. The MMC_CAP2_RO_ACTIVE_HIGH (write protect) flag is also set incorrectly for the exact same reason (it uses the same uninitialized variable), so this patch fixes that too. Fixes: 89168b489915 ("mmc: core: restore detect line inversion semantics") Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-11-05 08:22:41 +08:00
0, &cd_gpio_invert);
mmc: core: Return error at failure of request CD/WP in mmc_of_parse() Instead of just printing an error when mmc_of_parse() fails to request CD/WP GPIO pins, let's propagate all errors, except for -ENOENT. Earlier only -EPROBE_DEFER was handled correctly. As a side effect of this change and by relying on host drivers to handle the errors during ->probe(), we don't need to free any data in the error path. This also means we are actually fixing a bug, since we remove the call to mmc_gpio_free_cd() which wasn't the correct function to invoke to handle cleanup. Instead that should have been mmc_gpiod_free_cd(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 17:41:44 +08:00
if (!ret)
mmc: host: switch OF parser to use gpio descriptors This switches the central MMC OF parser to use gpio descriptors instead of grabbing GPIOs explicitly from the device tree. This strips out an unecessary use of the integer-based GPIO API that we want to get rid of, cuts down on code as the gpio descriptor code will handle active low flags. Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-08-27 19:00:52 +08:00
dev_info(host->parent, "Got CD GPIO\n");
mmc: core: Don't return an error for CD/WP GPIOs when GPIOLIB is unset When CONFIG_GPIOLIB is unset, its stubs will return -ENOSYS. That means when the mmc core parses DT for CD/WP GPIOs via mmc_of_parse(), -ENOSYS becomes propagated to the caller. Typically this means that the mmc host driver fails to probe. As the CD/WP GPIOs are already treated as optional, let's extend that to cover the case when CONFIG_GPIOLIB is unset. Reported-by: Michal Simek <michal.simek@xilinx.com> Fixes: 16b23787fc70 ("mmc: sdhci-of-arasan: Call OF parsing for MMC") Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Venu Byravarasu <vbyravarasu@nvidia.com>
2015-09-14 18:18:55 +08:00
else if (ret != -ENOENT && ret != -ENOSYS)
mmc: core: Return error at failure of request CD/WP in mmc_of_parse() Instead of just printing an error when mmc_of_parse() fails to request CD/WP GPIO pins, let's propagate all errors, except for -ENOENT. Earlier only -EPROBE_DEFER was handled correctly. As a side effect of this change and by relying on host drivers to handle the errors during ->probe(), we don't need to free any data in the error path. This also means we are actually fixing a bug, since we remove the call to mmc_gpio_free_cd() which wasn't the correct function to invoke to handle cleanup. Instead that should have been mmc_gpiod_free_cd(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 17:41:44 +08:00
return ret;
mmc: core: restore detect line inversion semantics commit 98e90de99a0c43bd434da814c882c4332441871e "mmc: host: switch OF parser to use gpio descriptors" switched the semantic behaviour of card detect and read only flags such that the inversion capability flag would only be set if inversion was explicitly specified in the device tree, in the hopes that no-one was using double inversion. It turns out that the XOR:ing between the explicit inversion was indeed in use, so we need to restore the old semantics where both ways of inversion are checked and the end result XOR:ed. Reported-by: Javier Martinez Canillas <javier@dowhile0.org> Tested-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-10-02 15:08:46 +08:00
/*
* There are two ways to flag that the CD line is inverted:
* through the cd-inverted flag and by the GPIO line itself
* being inverted from the GPIO subsystem. This is a leftover
* from the times when the GPIO subsystem did not make it
* possible to flag a line as inverted.
*
* If the capability on the host AND the GPIO line are
* both inverted, the end result is that the CD line is
* not inverted.
*/
mmc: core: fix card detection regression Since commit 89168b489915 ("mmc: core: restore detect line inversion semantics"), the SD card on i.MX28 (and possibly other) devices isn't detected and booting stops at: [ 4.120617] Waiting for root device /dev/mmcblk0p3... This is caused by the MMC_CAP2_CD_ACTIVE_HIGH flag being set incorrectly when the host controller doesn't use a GPIO for card detection (but instead uses a dedicated pin). In this case mmc_gpiod_request_cd() will return before assigning to the gpio_invert variable, leaving the variable uninitialized. The variable then gets used to set the flag. This patch fixes the issue by making sure gpio_invert is set to false when a GPIO isn't used. After this patch, i.MX28 boots fine. The MMC_CAP2_RO_ACTIVE_HIGH (write protect) flag is also set incorrectly for the exact same reason (it uses the same uninitialized variable), so this patch fixes that too. Fixes: 89168b489915 ("mmc: core: restore detect line inversion semantics") Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-11-05 08:22:41 +08:00
if (cd_cap_invert ^ cd_gpio_invert)
mmc: core: restore detect line inversion semantics commit 98e90de99a0c43bd434da814c882c4332441871e "mmc: host: switch OF parser to use gpio descriptors" switched the semantic behaviour of card detect and read only flags such that the inversion capability flag would only be set if inversion was explicitly specified in the device tree, in the hopes that no-one was using double inversion. It turns out that the XOR:ing between the explicit inversion was indeed in use, so we need to restore the old semantics where both ways of inversion are checked and the end result XOR:ed. Reported-by: Javier Martinez Canillas <javier@dowhile0.org> Tested-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-10-02 15:08:46 +08:00
host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
}
/* Parse Write Protection */
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
ro_cap_invert = device_property_read_bool(dev, "wp-inverted");
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
mmc: core: fix card detection regression Since commit 89168b489915 ("mmc: core: restore detect line inversion semantics"), the SD card on i.MX28 (and possibly other) devices isn't detected and booting stops at: [ 4.120617] Waiting for root device /dev/mmcblk0p3... This is caused by the MMC_CAP2_CD_ACTIVE_HIGH flag being set incorrectly when the host controller doesn't use a GPIO for card detection (but instead uses a dedicated pin). In this case mmc_gpiod_request_cd() will return before assigning to the gpio_invert variable, leaving the variable uninitialized. The variable then gets used to set the flag. This patch fixes the issue by making sure gpio_invert is set to false when a GPIO isn't used. After this patch, i.MX28 boots fine. The MMC_CAP2_RO_ACTIVE_HIGH (write protect) flag is also set incorrectly for the exact same reason (it uses the same uninitialized variable), so this patch fixes that too. Fixes: 89168b489915 ("mmc: core: restore detect line inversion semantics") Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-11-05 08:22:41 +08:00
ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
mmc: core: Return error at failure of request CD/WP in mmc_of_parse() Instead of just printing an error when mmc_of_parse() fails to request CD/WP GPIO pins, let's propagate all errors, except for -ENOENT. Earlier only -EPROBE_DEFER was handled correctly. As a side effect of this change and by relying on host drivers to handle the errors during ->probe(), we don't need to free any data in the error path. This also means we are actually fixing a bug, since we remove the call to mmc_gpio_free_cd() which wasn't the correct function to invoke to handle cleanup. Instead that should have been mmc_gpiod_free_cd(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 17:41:44 +08:00
if (!ret)
mmc: host: switch OF parser to use gpio descriptors This switches the central MMC OF parser to use gpio descriptors instead of grabbing GPIOs explicitly from the device tree. This strips out an unecessary use of the integer-based GPIO API that we want to get rid of, cuts down on code as the gpio descriptor code will handle active low flags. Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-08-27 19:00:52 +08:00
dev_info(host->parent, "Got WP GPIO\n");
mmc: core: Don't return an error for CD/WP GPIOs when GPIOLIB is unset When CONFIG_GPIOLIB is unset, its stubs will return -ENOSYS. That means when the mmc core parses DT for CD/WP GPIOs via mmc_of_parse(), -ENOSYS becomes propagated to the caller. Typically this means that the mmc host driver fails to probe. As the CD/WP GPIOs are already treated as optional, let's extend that to cover the case when CONFIG_GPIOLIB is unset. Reported-by: Michal Simek <michal.simek@xilinx.com> Fixes: 16b23787fc70 ("mmc: sdhci-of-arasan: Call OF parsing for MMC") Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Venu Byravarasu <vbyravarasu@nvidia.com>
2015-09-14 18:18:55 +08:00
else if (ret != -ENOENT && ret != -ENOSYS)
mmc: core: Return error at failure of request CD/WP in mmc_of_parse() Instead of just printing an error when mmc_of_parse() fails to request CD/WP GPIO pins, let's propagate all errors, except for -ENOENT. Earlier only -EPROBE_DEFER was handled correctly. As a side effect of this change and by relying on host drivers to handle the errors during ->probe(), we don't need to free any data in the error path. This also means we are actually fixing a bug, since we remove the call to mmc_gpio_free_cd() which wasn't the correct function to invoke to handle cleanup. Instead that should have been mmc_gpiod_free_cd(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 17:41:44 +08:00
return ret;
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "disable-wp"))
mmc: dt: Allow to specify that no write protect signal is present Allow to specify in the device-tree that no physical write-protect signal is connected to a particular instance of a MMC controller. Setting the property will cause the core will assume that the SD card is always read-write. The name for the new property is 'disable-wp' and was chosen based on the property with the same function from the Synopsys designware mobile storage host controller DT bindings specification. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk> Cc: Kumar Gala <galak@codeaurora.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 02:31:20 +08:00
host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
mmc: core: restore detect line inversion semantics commit 98e90de99a0c43bd434da814c882c4332441871e "mmc: host: switch OF parser to use gpio descriptors" switched the semantic behaviour of card detect and read only flags such that the inversion capability flag would only be set if inversion was explicitly specified in the device tree, in the hopes that no-one was using double inversion. It turns out that the XOR:ing between the explicit inversion was indeed in use, so we need to restore the old semantics where both ways of inversion are checked and the end result XOR:ed. Reported-by: Javier Martinez Canillas <javier@dowhile0.org> Tested-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-10-02 15:08:46 +08:00
/* See the comment on CD inversion above */
mmc: core: fix card detection regression Since commit 89168b489915 ("mmc: core: restore detect line inversion semantics"), the SD card on i.MX28 (and possibly other) devices isn't detected and booting stops at: [ 4.120617] Waiting for root device /dev/mmcblk0p3... This is caused by the MMC_CAP2_CD_ACTIVE_HIGH flag being set incorrectly when the host controller doesn't use a GPIO for card detection (but instead uses a dedicated pin). In this case mmc_gpiod_request_cd() will return before assigning to the gpio_invert variable, leaving the variable uninitialized. The variable then gets used to set the flag. This patch fixes the issue by making sure gpio_invert is set to false when a GPIO isn't used. After this patch, i.MX28 boots fine. The MMC_CAP2_RO_ACTIVE_HIGH (write protect) flag is also set incorrectly for the exact same reason (it uses the same uninitialized variable), so this patch fixes that too. Fixes: 89168b489915 ("mmc: core: restore detect line inversion semantics") Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-11-05 08:22:41 +08:00
if (ro_cap_invert ^ ro_gpio_invert)
mmc: core: restore detect line inversion semantics commit 98e90de99a0c43bd434da814c882c4332441871e "mmc: host: switch OF parser to use gpio descriptors" switched the semantic behaviour of card detect and read only flags such that the inversion capability flag would only be set if inversion was explicitly specified in the device tree, in the hopes that no-one was using double inversion. It turns out that the XOR:ing between the explicit inversion was indeed in use, so we need to restore the old semantics where both ways of inversion are checked and the end result XOR:ed. Reported-by: Javier Martinez Canillas <javier@dowhile0.org> Tested-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-10-02 15:08:46 +08:00
host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "cap-sd-highspeed"))
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
host->caps |= MMC_CAP_SD_HIGHSPEED;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "cap-mmc-highspeed"))
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
host->caps |= MMC_CAP_MMC_HIGHSPEED;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "sd-uhs-sdr12"))
mmc: core: Add DT bindings for SD card's UHS bus speed modes Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:07 +08:00
host->caps |= MMC_CAP_UHS_SDR12;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "sd-uhs-sdr25"))
mmc: core: Add DT bindings for SD card's UHS bus speed modes Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:07 +08:00
host->caps |= MMC_CAP_UHS_SDR25;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "sd-uhs-sdr50"))
mmc: core: Add DT bindings for SD card's UHS bus speed modes Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:07 +08:00
host->caps |= MMC_CAP_UHS_SDR50;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "sd-uhs-sdr104"))
mmc: core: Add DT bindings for SD card's UHS bus speed modes Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:07 +08:00
host->caps |= MMC_CAP_UHS_SDR104;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "sd-uhs-ddr50"))
mmc: core: Add DT bindings for SD card's UHS bus speed modes Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:07 +08:00
host->caps |= MMC_CAP_UHS_DDR50;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "cap-power-off-card"))
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
host->caps |= MMC_CAP_POWER_OFF_CARD;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
mmc: core: Add DT bindings for eMMC hardware reset support Sometime only need set MMC_CAP_HW_RESET for one of MMC hosts, So set it in device tree is better. Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-10-27 14:24:21 +08:00
host->caps |= MMC_CAP_HW_RESET;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "cap-sdio-irq"))
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
host->caps |= MMC_CAP_SDIO_IRQ;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "full-pwr-cycle"))
mmc: core: Add DT-bindings for MMC_CAP2_FULL_PWR_CYCLE The DT-binding for MMC_CAP2_FULL_PWR_CYCLE, is used to indicate whether it is possible to perform a full power cycle of the card. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 23:03:47 +08:00
host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "keep-power-in-suspend"))
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
host->pm_caps |= MMC_PM_KEEP_POWER;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "wakeup-source") ||
device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
mmc: add DT bindings for more MMC capability flags Many MMC capability flags are platform-dependent and are traditionally set in platform data. With DT often each such capability requires a special binding. Add bindings for MMC_CAP_SD_HIGHSPEED, MMC_CAP_MMC_HIGHSPEED, MMC_CAP_POWER_OFF_CARD and MMC_CAP_SDIO_IRQ capabilities. Also add code to DT parser to look up "keep-power-in-suspend" and "enable-sdio-wakeup" bindings and set MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ respectively, if found. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-15 23:14:01 +08:00
host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
mmc: core: Extend mmc_of_parse() to check for mmc-ddr-3_3v When mmc_of_parse() finds the binding, it sets the mmc cap, MMC_CAP_3_3V_DDR, which informs the core whether eMMC DDR at 3.3V I/O is supported by the mmc host. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com> Tested-by: Jan Glauber <jglauber@cavium.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
2017-01-25 19:45:43 +08:00
host->caps |= MMC_CAP_3_3V_DDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
mmc: core: Add DT bindings for eMMC high-speed DDR 1.8/1.2V Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:08 +08:00
host->caps |= MMC_CAP_1_8V_DDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
mmc: core: Add DT bindings for eMMC high-speed DDR 1.8/1.2V Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:08 +08:00
host->caps |= MMC_CAP_1_2V_DDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
mmc: core: Add DT bindings for eMMC HS200 1.8/1.2V Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:09 +08:00
host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
mmc: core: Add DT bindings for eMMC HS200 1.8/1.2V Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <chris@printf.net>
2014-02-14 20:27:09 +08:00
host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
mmc: core: add DT bindings for eMMC HS400 1.8/1.2V Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Specially, if host can support HS400, it means that host can also support HS200. Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <chris@printf.net>
2014-04-23 16:15:08 +08:00
host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
mmc: core: add DT bindings for eMMC HS400 1.8/1.2V Provide the option to configure these speed modes per host, for those host driver's that can't distinguish this in runtime. Specially, if host can support HS400, it means that host can also support HS200. Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <chris@printf.net>
2014-04-23 16:15:08 +08:00
host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
mmc: core: add mmc-hs400-enhanced-strobe support This patch introduce mmc-hs400-enhanced-strobe for platforms which want to enable enhanced strobe function from DT if the mmc host controller claims to support enhanced strobe. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-05-26 09:56:12 +08:00
host->caps2 |= MMC_CAP2_HS400_ES;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "no-sdio"))
mmc: core: expose MMC_CAP2_NO_* to dt The reason for why we expose these to dt is that some of the controller is unable to send special cmd type due to the hw limitation. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-07-14 16:26:04 +08:00
host->caps2 |= MMC_CAP2_NO_SDIO;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "no-sd"))
mmc: core: expose MMC_CAP2_NO_* to dt The reason for why we expose these to dt is that some of the controller is unable to send special cmd type due to the hw limitation. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-07-14 16:26:04 +08:00
host->caps2 |= MMC_CAP2_NO_SD;
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
if (device_property_read_bool(dev, "no-mmc"))
mmc: core: expose MMC_CAP2_NO_* to dt The reason for why we expose these to dt is that some of the controller is unable to send special cmd type due to the hw limitation. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-07-14 16:26:04 +08:00
host->caps2 |= MMC_CAP2_NO_MMC;
mmc: return mmc_of_parse() errors to caller In addition to just logging errors encountered during DT parsing or allocating GPIO slots for CD/WP, mmc_of_parse() now returns with an error. In particular, this is needed if the GPIO allocation may return EPROBE_DEFER. Signed-off-by: Simon Baatz <gmbnomis@gmail.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 04:14:11 +08:00
mmc: core: Use device_property_read instead of of_property_read Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by: David Woods <dwoods@mellanox.com> Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: stable@vger.linux.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-05-27 05:53:21 +08:00
host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
mmc: implement Driver Stage Register handling Some eMMC and SD cards implement a DSR register that allows to tune raise/fall times and drive strength of the CMD and DATA outputs. The values to use depend on the card in use and the host. It might be needed to reduce the drive strength to prevent voltage peaks above the host's specification. Implement a 'dsr' devicetree property that allows to specify the value to set the DSR to. For non-dt setups the new members of mmc_host can be set by board code. This patch was initially authored by Sascha Hauer. It contains improvements authored by Markus Niebel and Uwe Kleine-König. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-08-19 16:45:51 +08:00
if (host->dsr_req && (host->dsr & ~0xffff)) {
dev_err(host->parent,
"device tree specified broken value for DSR: 0x%x, ignoring\n",
host->dsr);
host->dsr_req = 0;
}
mmc: core: Initial support for MMC power sequences System on chip designs may specify a specific MMC power sequence. To successfully detect an (e)MMC/SD/SDIO card, that power sequence must be followed while initializing the card. To be able to handle these SOC specific power sequences, let's add a MMC power sequence interface. It provides the following functions to help the mmc core to deal with these power sequences. mmc_pwrseq_alloc() - Invoked from mmc_of_parse(), to initialize data. mmc_pwrseq_pre_power_on()- Invoked in the beginning of mmc_power_up(). mmc_pwrseq_post_power_on()- Invoked at the end in mmc_power_up(). mmc_pwrseq_power_off()- Invoked from mmc_power_off(). mmc_pwrseq_free() - Invoked from mmc_free_host(), to free data. Each MMC power sequence provider will be responsible to implement a set of callbacks. These callbacks mirrors the functions above. This patch adds the skeleton, following patches will extend the core of the MMC power sequence and add support for a specific simple MMC power sequence. Do note, since the mmc_pwrseq_alloc() is invoked from mmc_of_parse(), host drivers needs to make use of this API to enable the support for MMC power sequences. Moreover the MMC power sequence support depends on CONFIG_OF. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
2014-11-28 21:38:36 +08:00
return mmc_pwrseq_alloc(host);
mmc: provide a standard MMC device-tree binding parser centrally MMC defines a number of standard DT bindings. Having each driver parse them individually adds code redundancy and is error prone. Provide a standard function to unify the parsing. After all drivers are converted to using it instead of their own parsers, this function can be integrated into mmc_alloc_host(). Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-02-16 23:21:16 +08:00
}
EXPORT_SYMBOL(mmc_of_parse);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
/**
* mmc_alloc_host - initialise the per-host structure.
* @extra: sizeof private data structure
* @dev: pointer to host device model structure
*
* Initialise the per-host structure.
*/
struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
{
mmc: set controller name early Reorganise code so that mmc_hostname() works directly after allocation. That way host drivers can use that name for resource allocations and messages during probing. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-03-09 06:43:19 +08:00
int err;
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
struct mmc_host *host;
drivers/mmc/core/host.c: kmalloc + memset conversion to kzalloc drivers/mmc/core/host.c | 3509 -> 3457 (-52 bytes) drivers/mmc/core/host.o | 92400 -> 92136 (-264 bytes) Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-08-11 05:00:50 +08:00
host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
if (!host)
return NULL;
mmc: prohibit card detection when host is not ready Currently mmc host drivers have to decide whether to enable card detection before calling mmc_add_host() -- in which case a card insertion event can arrive before the host has been completely initialised -- or after mmc_add_host(), in which case the initial card detection can be problematic. This patch adds an explicit indication of when card detection should not be carried out. With it in place enabling card detection before calling mmc_add_host() should be safe. Similarly, disabling it again after calling mmc_remove_host() will avoid any races. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-06-14 16:17:39 +08:00
/* scanning will be enabled when we're ready */
host->rescan_disable = 1;
mmc: core: Convert from IDR to IDA for host indexes As IDA is more lightweight than IDR, let's convert to use that instead. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-04-07 17:40:59 +08:00
mmc: core: simplify ida handling ida handling can be simplified by switching to the ida_simple_ functions. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-01-28 16:32:35 +08:00
err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
if (err < 0) {
mmc: core: Convert from IDR to IDA for host indexes As IDA is more lightweight than IDR, let's convert to use that instead. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-04-07 17:40:59 +08:00
kfree(host);
return NULL;
}
mmc: core: simplify ida handling ida handling can be simplified by switching to the ida_simple_ functions. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-01-28 16:32:35 +08:00
host->index = err;
mmc: set controller name early Reorganise code so that mmc_hostname() works directly after allocation. That way host drivers can use that name for resource allocations and messages during probing. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-03-09 06:43:19 +08:00
mmc: struct device - replace bus_id with dev_name(), dev_set_name() Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-Off-By: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-11-09 04:37:46 +08:00
dev_set_name(&host->class_dev, "mmc%d", host->index);
mmc: set controller name early Reorganise code so that mmc_hostname() works directly after allocation. That way host drivers can use that name for resource allocations and messages during probing. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-03-09 06:43:19 +08:00
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
host->parent = dev;
host->class_dev.parent = dev;
host->class_dev.class = &mmc_host_class;
device_initialize(&host->class_dev);
mmc: core: enable mmc host device to suspend/resume asynchronously This patch enables mmc hosts to suspend/resume asynchronously. This will improve system suspend/resume speed. After applying this patch and enabling all mmc hosts' child devices to suspend/resume asynchronously on ASUS T100TA, the system suspend-to-idle time is reduced from 1645ms to 1107ms, and the system resume time is reduced from 940ms to 914ms. Signed-off-by: Zhonghui Fu <zhonghui.fu@linux.intel.com> Acked-by: Venu Byravarasu <vbyravarasu@nvidia.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-01-22 11:32:18 +08:00
device_enable_async_suspend(&host->class_dev);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
mmc: slot-gpio: Rework how to handle allocation of slot-gpio data By moving the allocation of the slot-gpio data into mmc_alloc_host(), we can remove the slot-gpio internal calls to mmc_gpio_alloc(). This means mmc_gpio_alloc() has now only one caller left, which consequence allow us to simplify and remove some of the slot-gpio code. Additionally, this makes the slot-gpio mutex redundant, so let's remove it. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 22:44:36 +08:00
if (mmc_gpio_alloc(host)) {
put_device(&host->class_dev);
mmc: core: fix error path in mmc_host_alloc Properly reverse everything if mmc_gpio_alloc(host) fails. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-01-28 16:32:50 +08:00
ida_simple_remove(&mmc_host_ida, host->index);
kfree(host);
mmc: slot-gpio: Rework how to handle allocation of slot-gpio data By moving the allocation of the slot-gpio data into mmc_alloc_host(), we can remove the slot-gpio internal calls to mmc_gpio_alloc(). This means mmc_gpio_alloc() has now only one caller left, which consequence allow us to simplify and remove some of the slot-gpio code. Additionally, this makes the slot-gpio mutex redundant, so let's remove it. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-18 22:44:36 +08:00
return NULL;
}
mmc: Aggressive clock gating framework This patch modifies the MMC core code to optionally call the set_ios() operation on the driver with the clock frequency set to 0 (gate) after a grace period of at least 8 MCLK cycles, then restore it (ungate) before any new request. This gives the driver the option to shut down the MCI clock to the MMC/SD card when the clock frequency is 0, i.e. the core has stated that the MCI clock does not need to be generated. It is inspired by existing clock gating code found in the OMAP and Atmel drivers and brings this up to the host abstraction. Gating is performed before and after any MMC request. This patchset implements this for the MMCI/PL180 MMC/SD host controller, but it should be simple to switch OMAP/Atmel over to using this instead. mmc_set_{gated,ungated}() add variable protection to the state holders for the clock gating code. This is particularly important when ordinary .set_ios() calls would race with the .set_ios() call resulting from a delayed gate operation. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Chris Ball <cjb@laptop.org> Tested-by: Chris Ball <cjb@laptop.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2010-11-09 10:36:50 +08:00
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
spin_lock_init(&host->lock);
init_waitqueue_head(&host->wq);
INIT_DELAYED_WORK(&host->detect, mmc_rescan);
mmc: sdio: Add API to manage SDIO IRQs from a workqueue For hosts not supporting MMC_CAP2_SDIO_IRQ_NOTHREAD but MMC_CAP_SDIO_IRQ, the SDIO IRQs are processed from a dedicated kernel thread. For these cases, the host calls mmc_signal_sdio_irq() from its ISR to signal a new SDIO IRQ. Signaling an SDIO IRQ makes the host's ->enable_sdio_irq() callback to be invoked to temporary disable the IRQs, before the kernel thread is woken up to process it. When processing of the IRQs are completed, they are re-enabled by the kernel thread, again via invoking the host's ->enable_sdio_irq(). The observation from this, is that the execution path is being unnecessary complex, as the host driver already knows that it needs to temporary disable the IRQs before signaling a new one. Moreover, replacing the kernel thread with a work/workqueue would not only greatly simplify the code, but also make it more robust. To address the above problems, let's continue to build upon the support for MMC_CAP2_SDIO_IRQ_NOTHREAD, as it already implements SDIO IRQs to be processed without using the clumsy kernel thread and without the ping-pong calls of the host's ->enable_sdio_irq() callback for each processed IRQ. Therefore, let's add new API sdio_signal_irq(), which enables hosts to signal/process SDIO IRQs by using a work/workqueue, rather than using the kernel thread. Add also a new host callback ->ack_sdio_irq(), which the work invokes when the SDIO IRQs have been processed. This informs the host about when it shall re-enable the SDIO IRQs. Potentially, we could re-use the existing ->enable_sdio_irq() callback instead of adding a new one, however it has turned out that it's more convenient for hosts to get this information via a separate callback. Hosts that wants to use this new method to signal/process SDIO IRQs, must enable MMC_CAP2_SDIO_IRQ_NOTHREAD and implement the ->ack_sdio_irq() callback. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org>
2017-04-13 22:48:11 +08:00
INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
mmc: host: Add facility to support re-tuning Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 18:10:12 +08:00
setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
/*
* By default, hosts do not support SGIO or large requests.
* They have to set these according to their abilities.
*/
mmc: Remove distinction between hw and phys segments We have deprecated the distinction between hardware and physical segments in the block layer. Consolidate the two limits into one in drivers/mmc/. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2010-09-10 13:33:59 +08:00
host->max_segs = 1;
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago with promise that one day it will be possible to implement page cache with bigger chunks than PAGE_SIZE. This promise never materialized. And unlikely will. We have many places where PAGE_CACHE_SIZE assumed to be equal to PAGE_SIZE. And it's constant source of confusion on whether PAGE_CACHE_* or PAGE_* constant should be used in a particular case, especially on the border between fs and mm. Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much breakage to be doable. Let's stop pretending that pages in page cache are special. They are not. The changes are pretty straight-forward: - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN}; - page_cache_get() -> get_page(); - page_cache_release() -> put_page(); This patch contains automated changes generated with coccinelle using script below. For some reason, coccinelle doesn't patch header files. I've called spatch for them manually. The only adjustment after coccinelle is revert of changes to PAGE_CAHCE_ALIGN definition: we are going to drop it later. There are few places in the code where coccinelle didn't reach. I'll fix them manually in a separate patch. Comments and documentation also will be addressed with the separate patch. virtual patch @@ expression E; @@ - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ expression E; @@ - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ @@ - PAGE_CACHE_SHIFT + PAGE_SHIFT @@ @@ - PAGE_CACHE_SIZE + PAGE_SIZE @@ @@ - PAGE_CACHE_MASK + PAGE_MASK @@ expression E; @@ - PAGE_CACHE_ALIGN(E) + PAGE_ALIGN(E) @@ expression E; @@ - page_cache_get(E) + get_page(E) @@ expression E; @@ - page_cache_release(E) + put_page(E) Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 20:29:47 +08:00
host->max_seg_size = PAGE_SIZE;
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago with promise that one day it will be possible to implement page cache with bigger chunks than PAGE_SIZE. This promise never materialized. And unlikely will. We have many places where PAGE_CACHE_SIZE assumed to be equal to PAGE_SIZE. And it's constant source of confusion on whether PAGE_CACHE_* or PAGE_* constant should be used in a particular case, especially on the border between fs and mm. Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much breakage to be doable. Let's stop pretending that pages in page cache are special. They are not. The changes are pretty straight-forward: - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN}; - page_cache_get() -> get_page(); - page_cache_release() -> put_page(); This patch contains automated changes generated with coccinelle using script below. For some reason, coccinelle doesn't patch header files. I've called spatch for them manually. The only adjustment after coccinelle is revert of changes to PAGE_CAHCE_ALIGN definition: we are going to drop it later. There are few places in the code where coccinelle didn't reach. I'll fix them manually in a separate patch. Comments and documentation also will be addressed with the separate patch. virtual patch @@ expression E; @@ - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ expression E; @@ - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ @@ - PAGE_CACHE_SHIFT + PAGE_SHIFT @@ @@ - PAGE_CACHE_SIZE + PAGE_SIZE @@ @@ - PAGE_CACHE_MASK + PAGE_MASK @@ expression E; @@ - PAGE_CACHE_ALIGN(E) + PAGE_ALIGN(E) @@ expression E; @@ - page_cache_get(E) + get_page(E) @@ expression E; @@ - page_cache_release(E) + put_page(E) Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 20:29:47 +08:00
host->max_req_size = PAGE_SIZE;
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
host->max_blk_size = 512;
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago with promise that one day it will be possible to implement page cache with bigger chunks than PAGE_SIZE. This promise never materialized. And unlikely will. We have many places where PAGE_CACHE_SIZE assumed to be equal to PAGE_SIZE. And it's constant source of confusion on whether PAGE_CACHE_* or PAGE_* constant should be used in a particular case, especially on the border between fs and mm. Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much breakage to be doable. Let's stop pretending that pages in page cache are special. They are not. The changes are pretty straight-forward: - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN}; - page_cache_get() -> get_page(); - page_cache_release() -> put_page(); This patch contains automated changes generated with coccinelle using script below. For some reason, coccinelle doesn't patch header files. I've called spatch for them manually. The only adjustment after coccinelle is revert of changes to PAGE_CAHCE_ALIGN definition: we are going to drop it later. There are few places in the code where coccinelle didn't reach. I'll fix them manually in a separate patch. Comments and documentation also will be addressed with the separate patch. virtual patch @@ expression E; @@ - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ expression E; @@ - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ @@ - PAGE_CACHE_SHIFT + PAGE_SHIFT @@ @@ - PAGE_CACHE_SIZE + PAGE_SIZE @@ @@ - PAGE_CACHE_MASK + PAGE_MASK @@ expression E; @@ - PAGE_CACHE_ALIGN(E) + PAGE_ALIGN(E) @@ expression E; @@ - page_cache_get(E) + get_page(E) @@ expression E; @@ - page_cache_release(E) + put_page(E) Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 20:29:47 +08:00
host->max_blk_count = PAGE_SIZE / 512;
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
return host;
}
EXPORT_SYMBOL(mmc_alloc_host);
/**
* mmc_add_host - initialise host hardware
* @host: mmc host
mmc: update kerneldoc Make sure the kerneldoc comments are up to date and relevant. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-07-12 02:22:11 +08:00
*
* Register the host with the driver model. The host must be
* prepared to start servicing requests before this function
* completes.
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
*/
int mmc_add_host(struct mmc_host *host)
{
int err;
sdio: add interface for host side SDIO interrupt reporting Signed-off-by: Nicolas Pitre <npitre@mvista.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-07-24 14:09:39 +08:00
WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
!host->ops->enable_sdio_irq);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
err = device_add(&host->class_dev);
if (err)
return err;
mmc: core: fix memory leak in mmc_add_host led_trigger_register_simple() allocates memory which must not be leaked in the error-path of mmc_add_host. Move it past the only error-check in the function. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-04-11 12:11:29 +08:00
led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
mmc: Export internal host state through debugfs When CONFIG_DEBUG_FS is set, create a few files under /sys/kernel/debug containing information about an mmc host's internal state. Currently, just a single file is created, "ios", which contains information about the current operating parameters for the bus (clock speed, bus width, etc.) Host drivers can add additional files and directories under the host's root directory by passing the debugfs_root field in struct mmc_host as the 'parent' parameter to debugfs_create_*. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-07-24 20:18:57 +08:00
#ifdef CONFIG_DEBUG_FS
mmc_add_host_debugfs(host);
#endif
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
mmc_start_host(host);
mmc: core: Refactor code to register the MMC PM notifier Instead of checking for "#ifdef" directly in the code, let's invent a pair of mmc core functions to deal with register/unregister the MMC PM notifier block. Implement stubs for these functions when CONFIG_PM_SLEEP is unset, as in that case the PM notifiers isn't used. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-11-05 23:11:12 +08:00
mmc_register_pm_notifier(host);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
return 0;
}
EXPORT_SYMBOL(mmc_add_host);
/**
* mmc_remove_host - remove host hardware
* @host: mmc host
*
* Unregister and remove all cards associated with this host,
mmc: update kerneldoc Make sure the kerneldoc comments are up to date and relevant. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-07-12 02:22:11 +08:00
* and power down the MMC bus. No new requests will be issued
* after this function has returned.
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
*/
void mmc_remove_host(struct mmc_host *host)
{
mmc: core: Refactor code to register the MMC PM notifier Instead of checking for "#ifdef" directly in the code, let's invent a pair of mmc core functions to deal with register/unregister the MMC PM notifier block. Implement stubs for these functions when CONFIG_PM_SLEEP is unset, as in that case the PM notifiers isn't used. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-11-05 23:11:12 +08:00
mmc_unregister_pm_notifier(host);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
mmc_stop_host(host);
mmc: Export internal host state through debugfs When CONFIG_DEBUG_FS is set, create a few files under /sys/kernel/debug containing information about an mmc host's internal state. Currently, just a single file is created, "ios", which contains information about the current operating parameters for the bus (clock speed, bus width, etc.) Host drivers can add additional files and directories under the host's root directory by passing the debugfs_root field in struct mmc_host as the 'parent' parameter to debugfs_create_*. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-07-24 20:18:57 +08:00
#ifdef CONFIG_DEBUG_FS
mmc_remove_host_debugfs(host);
#endif
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
device_del(&host->class_dev);
mmc: use correct unregister function for led trigger We register a simple trigger so make sure we use the corresponding unregister function. (Also means we get a dummy function when triggers aren't compiled in) Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-10-13 04:48:46 +08:00
led_trigger_unregister_simple(host->led);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
}
EXPORT_SYMBOL(mmc_remove_host);
/**
* mmc_free_host - free the host structure
* @host: mmc host
*
* Free the host once all references to it have been dropped.
*/
void mmc_free_host(struct mmc_host *host)
{
mmc: core: Initial support for MMC power sequences System on chip designs may specify a specific MMC power sequence. To successfully detect an (e)MMC/SD/SDIO card, that power sequence must be followed while initializing the card. To be able to handle these SOC specific power sequences, let's add a MMC power sequence interface. It provides the following functions to help the mmc core to deal with these power sequences. mmc_pwrseq_alloc() - Invoked from mmc_of_parse(), to initialize data. mmc_pwrseq_pre_power_on()- Invoked in the beginning of mmc_power_up(). mmc_pwrseq_post_power_on()- Invoked at the end in mmc_power_up(). mmc_pwrseq_power_off()- Invoked from mmc_power_off(). mmc_pwrseq_free() - Invoked from mmc_free_host(), to free data. Each MMC power sequence provider will be responsible to implement a set of callbacks. These callbacks mirrors the functions above. This patch adds the skeleton, following patches will extend the core of the MMC power sequence and add support for a specific simple MMC power sequence. Do note, since the mmc_pwrseq_alloc() is invoked from mmc_of_parse(), host drivers needs to make use of this API to enable the support for MMC power sequences. Moreover the MMC power sequence support depends on CONFIG_OF. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
2014-11-28 21:38:36 +08:00
mmc_pwrseq_free(host);
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 20:06:24 +08:00
put_device(&host->class_dev);
}
EXPORT_SYMBOL(mmc_free_host);